Offhand disabled

i have ViaBackwards, ViaRewind and ViaVersion installed, my server version is paper 1.20.1 but i wanted the retrocompatibility with 1.8 for Bedwards and PvP, but they are preventing using the offhand in my vanilla world (im using a world based server with perworldplugin installed and not bungecoord) which of them is causing the problem and how i fix it?
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